Printing-press.



No. 662,355. Patented Nov. 27, I900. E. HEIT.

PRINTING PRESS.

(Application filed Mar. 6, 1899,;

2 Sheets-Sheet I.

(No Model.)

m Sg

WITNESSES:

INVENTOR $0M) WW ATTORNEYS No. 662,855. Patented Nov. 27, I900. E. HETT.

PRINTING PRESS.

(Applichtion filed Mar. 6, 1899.)

2 Sheets-Sheet 2.

- (No Nodal.)

WITNESSES:

ATTORNEY 3 Tu: Noam: Pnzns co. PHDTO-LITHO., wnsHmGToN. D. c.

UlTF TTFS PATENT @trrbti.

EDWARD HETT, OF NEW YORK, N. Y.-

Pampas-eases.

SPECIFICATION formingpart of Letters Patent No. 662,855, dated November27, 1900.

Serial No. 707,923. \No model- To all whom it may concern:

Be itknown that I, EDWARD HETT, a citizen of the United States, and aresident of New York,(New Dorp,) in the county of Richmond, State of NewYork, have invented certain new and useful Improvements in Printing-Presses, of which the following is a specification.

My invention relates to printing-presses,and particularly tomulticolor-printing presses and to multicolor-printing upon sheets, andit relates also to such printing with planographic printing-surfaces,and it has more particular reference to the printing-surfaces employedin such presses and their combinations.

It has for its objects to apply the rotarypress principle and the curvedprinting-surfaces involved therein to the case of printing upon separatesheets of paper and generally to improve and cheapen that class ofprinting.

The invention consists in the novel features, constructions, andcombinations of parts herein shown and described.

The accompanying drawings, which form a part hereof, represent aprinting-press and a printing-plate embodying my invention in itspreferred form.

Figure l is a side elevation of the rotary ing-form upon the formsupportat one end thereof. Fig. 5 is a detail and sectional view showing partof the means for combining the printing-form with its form-support. Fig.6 is a diagrammatic sketch of a planographic printing-press for printingon the sheet, showing the preferred method of combination ofa series ofthe printing-forms in a press.

Like letters of reference in the several figures indicate like parts.

A is the shaft with which the printingform rotates in the operation ofprinting.

J is a roller which is carried by the spokes K, projecting from a hubwhich is keyed t0 the shaft A, so as to move with it.

B is a portion of a hollow cylinder or roller, less than the wholecircumference, (in the drawings it is shown as one-half. of thiscircumference,) which is carried by spokes C,

projecting from a hub which is loosely mounted on the shaft A. Thissectional roller B, or section ofa roller, as it may be called, is asnug fit for that part of the circumference of the roller J which itincloses. It is adjustable circum-ferentially on the roller J within thenecessary limits. That adjustment is attained by means of aninwardly-projecting lug D on the sectional roller 13, which movesbetween two lugs L L on the roller J. Its position between the two lugsL L is determined by the adjustment of the screws E E. By this means thecircumferential position of the sectional roller B upon the roller J maybe adjusted within the required limits and in that way thecircumferential position with reference to the shaft A of theprinting-form which is carried on said sectional roller B.

The parts thus far described constitute the interior form-support of myinvention.

1 is the exterior curved printing-form. It is fitted interiorly to besupported by the sectional roller B, and it has two radially-dependingor inwardly projecting lugs M, which extend from side to side of theprinting-form, one near one end and one near the other end. Thesectional roller B has slots F, which exactly correspond to andaccurately fit the lugs M, as is clearly shown in Fig. 5. These lugs,with their corresponding slots F, may be more in number, if desired. Theprinting-form is readily applicable to and removable from thefor1n--support. It is applied by sliding it onto the sectional roller Bfrom one end of the roller, the lugsM sliding in their correspondingslots F. The printingform is adjusted and held in positionlongitudinally of the roller in the following manner: The side pieces[-1 H after the printingform is in place are screwed fast to the sidesof the sectional roller B. At one end of the roller and passing througha threaded hole in said plate H is an adjusting and starting screw-boltN, which has an enlarged head within the depending lug of theprintingform, as shown in Fig. 3. By turning the screw-bolt N theprinting-form can be moved back and forth on the sectional roller B, thelugs M sliding in the slots F. This device may be usedto start theprinting-form on its support when it is desired to remove it. It

may also be used to secure those fine longitudinal adjustments of theprinting-form on its support that may be desirable. To turn thescrew-bolt N in one direction moves the printing-form in one directionon the sectional roller B, and to'screw the screw-bolt in the otherdirection moves the printingform in the other direction on the sectionalroller B. G is a jam-nut to lock the screw-boltN in any position towhichit may have been adjusted. At the other side of the printing-formis an adjustable stop, being a screw-bolt 0, carried in ascrew-threadedhole in the side pieces H at that side of the roller B. This screwbolt 0may be screwed in more or less and takes against the printing-form orsome part of it. It thus cooperates with the screw-bolt N in adjustingand holding the printing-form longitudinally on the form support. Thescrew-bolt 0 may have ajam-nut G, if desired. The circumferentialadjustment of the printing-form is attained, as heretofore described, bymeans of the screw-bolts E E.

I is the exterior curved printing-form. It is circumferentiallydiscontinuousthat is to say, its outer or printing surface does not forma complete circle or ellipse orany other complete curved form, butextends through a part only of the complete outline of such a curvedfigure. In the drawings it is represented as continuous throughoutmerely a semicircle of circumferential length and is discontinuousthroughout the second semicircle required to make a complete circle. Itmight of course extend through a greater or a less proportion of thecomplete circle or other curved figure of which its surface forms apart. This printingform I is in itself a rigid and infiexibleprinting-form, maintaining the substantial integrity of its shape whenoff as well as when on its support. It is curved exteriorly, and thiscurved exterior surface is circumferentially discontinuous and isprimarily-that is to say, before it receives its design-a planographicsurface. It is constructed interiorly to lit the form-support and isremovable therefrom and replaceable thereon, and it is primarilyconstructed exteriorly to fit the codperating parts of the press and ofexterior planographic surface suitable to receive a design, as by thelithographic process of transferring, and to be thereafter developed byetching or in any other suitable manner into a printing-surface for thatdesign of the character desired, as by light etching into a planographioprinting-surface orby deep etching, routing out, 850., into a reliefprintingsnrface, or otherwise. The printing-form is preferablycompositein its construction, consisting of an inner inflexible curvedbase adapted to lit the interior support, as described, and'an exteriorprinting-surface of different material formed on or applied to thecurved base and integral therewith. In the drawings 1 have representedthis printingform in the wayin which I prefer to build it namely, with athick substantial and so inflexible base a of aluminium, facedexteriorly with a thin layer of copper b and a thin printing-surface ofzinc c. Aluminium is preferred for the main body of the base by reasonof its lightness, though other materials might be employed-as, forexample, copper. 1- prefer for the printing-surfaceelectrolyticallydeposited zinc both for planographic printing-surfacesand for relief or intaglio printing-surfaces. I prefer, if the base islargely of aluminium, to face it with a thin layer of copper in order tofacilitate the electrodeposition of the zinc for the printing-surfaceand to improve the character of that surface and also to permit of theready removal of the zinc printing-surface, as by acids, after theprinting of a given design is completed, without removing the base orany part of it. Nitric acid, for instance, may be so used as to readilyand quickly and wholly remove the zinc without practically affecting thecopper.

This thin layer of copper may be applied to the aluminiumelectrolytically, and l preferto so apply it. For the purposes of mybroad invention other materials than zinc may be used for theprinting-surface; but the printing-surface mustbe cu rvedand inflexible,and when composite its parts must be integral one with another, andother materials maybe used for the base than those mentioned; butpreferably the material is different from that which constitutes theexterior printing-surface in order that the latter may be the morecapable of ready removal from the base and ready renewal thereon. Readyremoval may be accomplished, for instance, by the use of an acid whichattacks the material of the printing-surface, but does not substantiallyattack the material of the base, or the printing-surface may be removedmechanically, as in a lathe. While I prefer to apply the printingsurfaceby electrolytical deposition on the base, still it may be applied inother Waysfor instance, by castingso long as it constitutes with thebase an integral and an infiexible structure. By the combination of baseand printing-surface described the base may be once for allpainstakingly made to the exact dimensions required and perfectlyfitting its intended support, and may thereafter he used an indefinitenumber of times, reliably and accurately fitting into its supportingparts in the press, but having as its printing-surface a new and freshprintingsurface for each new printing job, whereby the cost of suchprinting-forms is greatly reduced and their character perfected and thecharacter and accuracy of work that they will achieve are greatlyimproved. Curved typographic printing-surfaces have heretofore beencast, the entire printing-form of one material and in one solid piece,the design being produced in the casting process, the

' whole having the inevitable imperfections of fit,register,&c.,whichcharacterize cast metal, which changes its temperature after receivingits permanent form, and flexible pr1nting-surfaces have been bent from astraight or flat form around curved supports and fastened and used insuch bent position. Many difficulties and inconveniences andinaccuracies, however, attend both these methods, and my improved curvedcircumferentiallydiscontinuous printing-form is an improvement in everyway upon them, the design being placed upon my printing-form after theform has passed through those mechanical processes necessary to make itmat-hematically and permanently accurate in dimensions. It is a matterof the greatest importance that the printing-surface should be smoothand even and the printing parts of absolutely uniform height withoutfold,wrinkle, holes, or inequalities of any kind, and these advantagesmy improved inflexible printing-form possesses in a marked degree. Thesequalities are of peculiar importance in planographic or lithographicprinting, and also in relief-plate printing where the reliefplates areobtained by the deep etching or otherwise of an original planographicsurface, which are the two branches of the art to which my invention isespecially applicable. Where my exterior printing-surface is applied byelectrical deposition to the curved interior base, the resultingprinting-form, as a whole, owes its exact shape and dimensions andperfection of form, 650., to the previous accurate shaping and formingof the solid and inflexible base, provision being made in the shape ofsaid base for the exact thickness of the uniform exteriorprinting-surface that is to be applied. lVhen this exterior printingsurface is applied by casting, the resulting printing-form asa whole inthe same Way may owe its exact shape and dimensionsto theaccurately-prepared base, upon the exterior surface of which the castingis made and in the shaping of which provision is made for the exactthickness of casting that is to be made upon it, or the exterior surfaceafter casting would betrued up, if found necessary, and made toaccurately lit the cooperating parts of the press, and its surface wouldbe made suitable, if not already so, to receive a design, and when inthis condition and all mechanical work completed and the curved formpermanently shaped for use interiorly and exteriorly it would receiveits design by the lithographic process and be developed into aprinting-surface for that design of the character desired. When thewhole printingform is cast in one piece of Zinc or aluminium or othermaterial, the form when thoroughly cool and when it has assumed itspermanent shape would be trued up interiorly and exteriorly to fit thesupporting and cooperating parts of the press and its surface suitablyfinished or prepared, and the design would then be transferred to it andthe surface thereupon developed into a printing-surface for that designof the character desired. Where the printing-form is composite, theprocess of applying the surface to the base should be so conducted as tomake the union bet-ween the exterior printi ng-sn rface and the innerinflexible base a firm and secure union, so that the two becomesubstantially integral in operation. I prefer, however, in thisconnection the method of appliction by electrolytical deposition. Afterthe printing-forms have been properly constructed, as described, theywill before use inthe printing-press re ceive in the shape of a suitabletransfer the design that they are to print. This design may betransferred to the printing-surfaces in any desired way. Preferably thisshould be done in a transfer-press which is provided with supportingdevices similar to the interior form-support heretofore described. Inthis way the transfer can be accurately made to the printing-surfacewith reference to its subsequent accurate printing in the printingpress.After the design is transferred to it it may be developed by suitableetching into a planographic printingsurface, or by deep etching,supplemented by the use of a routingout machine, if desired, it may bedeveloped into a relief printing-surface. In the latter case theprintingsurface, if the form is composite, should be slightly thickerthan is necessary in the former case, although in each case theprinting-surface may be thin in comparison with the relatively thick andinflexible base. I prefer to prepare a. series of printing-surfaces suchas described and to transfer to them a series of registering designsaccurately and with reference to one another in the manner, forinstance, set out in my application for patent, Serial No. 703,082,filed January 1899, and in application, Serial No. 695,2e1, filedNovember 2, 1898, and then to mount them in a suitable press-as, forinstance, in such a press as is shown diagrammatically in Fig. 6 of thedrawingsand then to print in approximately instantaneous succession fromthem.

Referring in detail to Fig. 6, I I represent a series of curvedcomposite printing-forms mounted upon their interior form-supports, asheretofore described. They are represented in Fig. 6 as planographicprinting-surfaces, printing a four-color job. Each printing-surface hasa suitable inking mechanism P and a suitable dampening mechanism Q. Thedetails of these mechanisms form no part of the present invention, andtherefore they need not be further described. There is animpression-drum on shaft R, suitably driven and by any suitablemechanism positively driving the four printirig-surfaces with it. Itssurface consists of a series of discontinuousimpression-surfacesS.'lheseimpressionsurfaces correspond in circumferential length with thecircumferential length of the printing'forms l, and the distancesbetween these discontinuous impression-surfaces in theface of the d ruin correspond to the circumferential distance between the ends of theprinting forms I. The printing-forms are arranged on the impression-faceof the drum as shown,and

they rotate positively with the drum. The paper is fed to the machine inthe form of sheets from the table T, either by hand or automatically, asdesired. The intervals caused by the discontinuous character of theprinting and impression surfaces give time for the feeding of thesheets. Suitable grippers may be used to hold the sheets on theimpression surface. Such devices having nothing to do with the presentinvention are not shown in the drawings and need not be furthermentioned. Theyshould beeffectual, however, to hold the sheets fromslipping upon the impression-surface, so that proper register may beobtained. The several printing-forms are suitably arranged withreference to one another to attain this register in the printing and aresuitably arranged with reference to the impression-surfaces to reliablyand accurately do the printing required of them. The apparatus forattaining these several adjustments forms no part of the presentinvention and need not be here described. At U is shown apparatus fordelivering finished sheets from the drum. Any suitable apparatus willanswer the purpose.

Where the printing is done upon the web and the designs are of such anature as to call for continuous printing on the web, I have employedcurved printing-surfaces that are circumferentially continuous, andimportant advantanges result from that construction, not only in economyof printing, but also in solidity of construction, combined withrelative lightness and thinness of parts. In the present invention,however, where it is designed to print intermittently and preferablyupon sheets giving intervals of time between each sheet and the nextwithin which to properly handle the sheets for feeding and grippingpurposes, it is not necessary or desirable to employ circumferentially-continuous pri n ting-surfaces. My invention avoids their use,but combines many of the advantages of such circumferentially continuousprinting surfaces with the discontinuous character of printing-surfacesuitable for the purpose in View. Theinteriorform-supportofmyinventionpreferably possesses the strength and rigidity of acircumferentially-continuous construction, although that is notabsolutely essential provided the support is strong enough without it;but myimproved printing-form by its substantial and rigid constructionand by its combination with an interior form-support attains theadvantages of strength and accuracy of printing which characterize circuinferentially continuous tubular printing surfaces,and myinven tionmakes available for intermittent printing, such as upon sheets, therotary-press principle, which is the cheapest and most perfect form ofprinting known, and by it also intermittent multicolor-printing on therotary-press principle is also made practicable.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a lithographic press, the combination with a form-supportingdevice, of a curved circumferentially discontinuous inflexible hollowshell-like removable and replaceable printing-form having an outersurface adapted to receive a lithographic drawing or transfer, theprinting-form being of shape and dimensions permanently fixed so as topermanently adapt the form to the cooperating parts of the press,substantially as described.

2. In a lithographic press, the combination with a suitable impressionsurface or surfaces, and suitable inking and dampening mechanisms,of aseries of form-supporting devices and aseries of curvedcircuinferentiallydiscontinuous inflexible hollow shell-like removableand replaceable printing-forms having outer surfaces adapted to receivea lithographic drawing or transfer, the printingforms being of shape anddimensions permanently fixed so as to permanently adapt the forms to thecooperating parts of the press, substantially as described.

In alithographic press, the combination of a form-supporting deviceadapted to be placed in position in a press, and a series of inflexibleremovable and replaceable curved circu mferentially-discontin noushollow shelllike printing-forms having outer surfaces adapted to receivea lithographic drawing or transfer, the printing-forms being each ofexactly the same shape and dimensions as the others so as to occupy,when placed upon the supporting device, exactly the same position andspace in the press as any one of the others when thus placed,substantially as de scribed.

t. In a lithographic press, the combination of a series ofform-supporting devices each having a prestablished seat forprintingforms which occupies the same position upon the support and isof the same shape and dimensions as those of the other form-supports,and a series of inflexible removable and replaceable curvedcircumferentially-discontinuous hollow shell-like printing-forms havingouter surfaces adapted to receive a lithographic drawing or transfer,the printingforms being each of exactly the same shape and dimensions asthe others so as to be interchangeable one with another, so that each,when placed upon a supporting device, will occupy exactly the sameposition and space in the press as any of the others would occupy ifplaced upon the said supporting device, substantially as described.

5. In a lithographic press,the combination, with a suitable impressionsurface or surfaces, and suitable inking and dampening mechanisms, of aseries of form-supporting devices and a series of curvedcircumferentially-discontinuous inflexible hollow shelllike removableand replaceable printingforms having outer surfaces adapted to receive alithographic drawing or transfer, the printing-forms being of shape anddimensions permanently fixed so as to permanently adapt the forms to thecooperating parts of the press, antlguilling means with reference towhich the positions of the forms upon the supports are fixed bothlongitudinally and circumferentially,substantially as described.

6. In a lithographic press, the combination with a form-supportingdevice, of a curved circumferentially discontinuous inflexible hollowshell-like removable and replaceable composite printing-form having anouter surface of suitable lithographic material adapted to receive alithographic drawing or transfer, and an inner strengthening-shell,substantially as described.

7. In a lithographic press, the combination with a form-supportingdevice, of a curved circumferentially discontinuous inflexible hollowshell-like removable and replaceable composite printing-form having anouter elec trodeposited surface adapted to receive a lithographicdrawing or transfer, and an inner strengthening-shell the printing-formbeing of shape and dimensions permanently fixed so as to permanentlyadapt the form to the cooperating parts of the press, substantially asdescribed.

8. A printing-form comprising a curved base of predetermined shape anddimensions, the base having a separate circumferential lydiscontinuouscurved printing-surface of pre determined thickness thereon, whichsurface is substantially integral with the base and which may beentirely removed from the base and be renewed thereon, to present afresh surface of predetermined size for each new design, theprinting-form being of shape and dimensions permanently fixed so as topermanently adapt the form to the cooperating parts of the press,substantially as described.

5). A printing-form comprising a circ um ferentially-discontinnouscurved base of predetermined shape and dimensions, the base having aseparate circumferentially-discontinuous curved printingsurface ofpredetermined thickness thereon, which surface is substantially integralwith the base and which may be entirely removed from the base and berenewed thereon, to present a fresh surface of predetermined size foreach new design, substantially as described.

10. A printing-form comprising a circumferentially-discontinuous curvedbase of predetermined shape and dimensions, the base having a separatecircumferentially-discon tinnous curved printing-surface ofpredetermined thickness thereon, which surface is substantially integralwith the base and which may be entirely removed from the base and berenewed thereon, to present a fresh surface of predetermined size foreach new design, the surface being adapted to receive a drawing ortransfer of a design and to be thereafter developed into aprinting-surface for that design of the character desired, substantiallyas described.

11. In a printing-press, the combination with a suitable impressionmechanism of a Series of printing-forms and means for supporting them inthe press in a cooperating relationship to the impression mechanism andto one another, the printing-forms comprising each acircumferentially-discontinuous curved base of predetermined shape anddimensions, the base having a separate circumferentiallydiscontinuouscurved printingsurface of predetermined thickness thereon, which surfaceis substantially integral with the base and which may be entirelyremoved from the base and be renewed thereon. to present a fresh surfaceof predetermined size for each new design, substantially as described.

12. A printing-form comprising a circumferentiallydiscontinuous curvedbase of predetermined shape and dimensions, the base having a separatecircumferentially-discontinnous electrodeposited printing-surface ofpredetermined thickness thereon, which surface is substantially integralwith the base and which may be entirely removed from the base and berenewed thereon, to present a fresh surface of predetermined size foreach new design,substantially as described.

13. A printing'form comprising a circum' ferentially-discontinnouscurved base of pre determined shape and dimensions, the base having aseparate circumferentially-discontinnous electrodeposited planographicprinting-surface of predetermined thickness thereon, which surface issubstantially integral with the base and which may be entirely removedfrom the base and be renewed thereon, to present a fresh surface ofpredetermined size for each new design, substantially as described.

14. A printing-form comprising a circumferentially-discontinuous curvedbase of predetermined shape and dimensions, the base having a separatecircumferentially-discontinnous electrodeposited printing-surface ofpredetermined thickness thereon, which surface is substantially integralwith the base and which may be entirely removed from the base and berenewed thereon, to present a fresh surface of predetermined size foreach new design, the surface being adapted to receive a drawing ortransfer of a design and to be thereafter developed into aprinting-surface for that design of the character desired, substantiallyas described.

15. In a printing-press, the combination with a suitable impressionmechanism of a series of printing-forms and means for supporting them inthe press in a cooperating relationship to the impression mechanism andto one another, the printing-forms comprising each acircumferentiallydiscontinuous curved base of predetermined shape anddimensions, the base having a separate circumferentially discontinuouselectrode-posited printing-surface of predetermined thickness thereon,which surface is substantially integral with the base and which may beentirely removed from the base and be renewed thereon,to present a freshsurface of predetermined size for each new design, substantially asdescribed.

16. A printing-form comprising a circumferentially-discontinnouscu rvedbase, of predetermined shape and dimensions, the base having a thincoating thereon, which coating is substantially integral with the baseand is adapted to be made into a printing-surface and which is entirelyremovable and renewable upon the base for each new design, the size ofthe form being determined by the size of the base, substantially asdescribed.

17. A printing-form comprising a circumferentially-discontinuous curvedbase, of predetermined shape and dimensions, the base having a thinplanographic coating thereon, which coating is substantially integralwith the base and is adapted to be made into a printing-surface andwhich is entirely removable and renewable upon the base for each newdesign, the size of the form being determined by the size of the base,substantially as described.

18. A printing-form comprising a circumferentially-discontinuous curvedbase, of predetermined shape and dimensions, the base having a thinelectrodeposited zinc coating thereon, which coating is substantiallyintegral with the base and is adapted to be made into a printing-surfaceand which is entirely removable and renewable upon the base for each newdesign, the size of the form being determined by the size of the base,substantially as described.

19. A printing-form comprising a curve eircumferentially-discontinuousbase of predetermined shape and dimensions, fixed so as to permanentlyadapt the form to the cooperating parts of the press, the base having aseparate removable planographic surface thereon, which surface issubstantially integral with the base and is adapted to receive a drawingor transfer of a design to be thereafter developed into aprinting-surface for the design of the character desired, and whichsurface can be removed from and then renewed on the base withoutsubstantially affecting the shape or dimensions of the form,substantially as and for the purposes set forth.

20. In a press, the combination, with a suitable impression-surface, ofa printing-form comprising a curved base of predetermined shape anddimensions, fixed so as to permanently adapt the form to the cooperatingparts of the press, the base having a separate removable curvedcircunlferentially-discontinuous printingsurface thereon,whichprinting-surface is substantially integral with the base and can beremoved from and then re newed on the base without substantiallyaffecting the shape and dimensions of the form, substantially as and forthe purposes set forth.

21. In a press, the combination, with a suitable impression-surfacc, ofa planographic printing-form comprising a curved base of predeterminedshape and dimensions, fixed so as to permanently adapt the form to thecooperating parts of the press, the base having a separate removablecurved circumferentially-discontinuous electrodeposited zincprinting-s11 rface thereon, which printing-surface is substantiallyintegral with the base and can be removed from and then renewed on thebase without substantially affecting the shape or dimensions of theform, substantially as and for the purposes set forth.

22. In a printing-press, the combination, with suitable impressionmechanism, of a series of printing-forms mounted in the press in acooperating relationship to the impression mechanism and to one another,the printingforms com iirising each a base of predetermined shape anddimensions, fixed so as to permanently adapt the form to the cooperatingparts of the press, the base having a separate removable curved circumferentially-discontinuous printing-surface thereon, whichprinting-surface is substantially integral with the base and can beremoved from and then renewed on the base without substantiallyaffecting the shape or dimensions of the form, substantially as and forthe purposes set forth.

23. In a printing-press, the combination, with an impression-drum havinga series of impression-surfaces adapted to carry sheets of paper, ofaseries of printing-forms mounted in the press, in a cooperatingrelationship to the im pression-drum and to one another, theprinting-forms comprising each a base of predetermined shape anddimensions, fixed so as to permanently adapt the form to the cooperatingparts of the press, the base having a separate removable curvedcircumferentiallydiscontinuous printingsurface thereon,which printing-surface is substantially integral with the base and can be removed fromand then renewed on the base without substantially affecting the shapeor dimensions of the form, substantially as and for the purposes setforth.

24. In a lithographic printing-press, the combination, with animpression-drn in having a series of impression-surfaces adapted tocarry sheets of paper, and a series of suitable inking and dampeningmechanisms, of a series of lithographic printing-forms mounted in thepress in a positive relationship to the impression surface or surfacesand to one another, the printing-forms comprising each a curved base ofpredetermined shape and dimensions fixed so as to permanently adapt theforms to the cooperating parts of the press, the base having a separateremovable curved circumferentially discontinuous printingsurfacethereon, which printing-surface is substantially integral with the baseand can be removed from and then renewed on the base withoutsubstantially affecting the shape or dimensions of the form,substantially as and for the purposes set forth.

25. The combination with an interior formsupport, of an exterior curvedcircumferentially-discontinuous inflexible printing-form constructedinteriorly to fit the support and removable therefrom and of exteriorelectro-.

lytically-deposited planographic zinc surface suitable to receive adesign as by the lithographic process of transferring and to bethereafter developed by etching or in other suitable manner into aprinting-surface for that design of the character desired, the printing-form being composite and consisting of an inner strengthening-basefaced exteriorly with copper and an outer printing-surface ofelectrolytically-deposited zinc.

26. The combination with an interior formsupport, of an exterior curvedcircumferentially-discontinnous inflexible printing-form constructedinteriorly to fit the support and removable therefrom and of exteriorelectrolytically-deposited planographic zinc surface suitable to receivea design as by the lithographic process of transferring and to bethereafter developed by etching or in other suitable manner into aprinting-surface for that design of the character desired, the printingform being composite and consisting of an inner strengtliiening-baseof aluminium faced exterior-1y with copper and an outer printing-surfaceof electrolytically-deposited zinc.

27. In a printing-press, the combination with an interior form-support,of an exterior curved circumferentially-discntinuous inflexibleprinting-form applicable to and removable from the support, theprinting-form being composite and consisting of an inner inflexiblecurved base of aluminium faced exteriorly with copper and permanentlyadapted to fit the interior support and a printing'surface of differentmaterial formed on or applied to the curved base and integral therewith,substantially as described.

28. In a printing-press, the combination with an interior form-support,of. an exterior curved circumferentially-discontinuous inflexibleprinting-form applicable to and removable froin the support, theprinting-form being composite and consisting of an inner inflexiblecurvedbase of aluminium faced exteriorly With copper and permanentlyadapted to fit the interior support and a zinc surface formed on orapplied to the curved base and integral therewitlnsubstantially asdescribed.

29. In a printii'ig-press, the combination with an interiorform-support, of an exterior curved circiunferentially-discontinousinflexible printing-form applicable to and re movable from the support,the printing-form being composite and consisting of an inner inflexiblecurved base of aluminium faced exteriorly with copper and permanentlyadapted to it the interior support and a zinc printing-surfaceelectrolytically deposited on the curved base and integral therewith,substantially as described.

30. In a printing-press, the combination with an interior form-support,of an exterior curved circumferentially-discontinuous inflexibleprinting-form applicable to and removable from the support, theprinting-form being composite and consisting of an inner inflexiblecurved base of aluminium faced exteriorly withelectrolytically-deposited copper and permanently adapted to fit theinterior support and a prii'iting-surface of different material formedon or applied to the curved base and integral therewith, substantiallyas flexible printing-form applicable to and removable from the support,the printing-form being composite and consisting of an inner inflexiblecurved base of aluminium faced exteriorly withelectrolytically-deposited copper and permanently adapted to fit theinterior support and a zinc printing-surface electrolyt ically depositedon the curved base and integral therewith, substantially as described.

In a planographic printing-press, the combination with an interior form-support, of an exterior curved cirenmferentially-discontinuousinflexible printing-form applioable to and removable from the support,the printing'form being composite and consisting of an inner inflexiblecurved base of aluminium faced exteriorly with copper and permanentlyadapted to fit the interior support and a thin planographic zincprinting-surface electrolytically deposited on the curved base andintegral therewith, substantially as described.

34. In a planographic printing-press, the combination with an interiorform-support, of an exterior curved circumferentially-discontinuousinflexible printing-form applicable to and removable from the support,the printing-form being composite and consisting of an inner inflexiblecurved base of aluminiuin faced exteriorly withelectrolyticallydeposited copper and permanently adapted to fit theinterior support and a thin pianographio Zinc printing-surfaceelectrolytically deposited on the'curved base and integral therewith,substantially as described.

35. In a printing-press, the combination with a suitableimpression-surface and a series of inking mechanisms, of a series ofinterior formsupports and a series of exterior curvedcircumferentiallydiscontinuous inflexible printing-forms, each formapplicable to and removable from its support and adjustablelongitudinally and circumferenrior curvedcircumferentially-discontinuous inflexible printing-forms, each formapplicable to and removable from its support and adjustablelongitudinally and circumferentially, the printing-forms being compositeand consisting of an inner inflexible curved base of aluminium facedexteriorly with copper and permanently adapted to fit the interiorsupport, and a zinc printing-surface electrolytically deposited on thecurved base and integral therewith, the printing-forms being arranged onthe impression-face of the drum and rotating positively therewith,substantiall y as described.

37. In a planographic printing-press, the combination With a suitableimpression-su face and a series of inking and dampening mechanisms, of aseries ofinterior form-supports and a series of exterior curvedcircumferentially-discontinuous inflexible printingforms, each formapplicable to and removable from its support and adjustablelongitudinally and circumferentially, the printing-forms being compositeand consisting of an inner inflexible curved base of aluminium facedexteriorly With copper and permanently adapted to fit the interiorsupport, and a thin planographic zinc printing-surface electrolyticallydeposited on the curved base and integral therewith, substantially asdescribed.

38. In a planographic printing-press, the combination With animpression-drum. having a series of discontinuous impression-surfacesand with a series of inking and dampening mechanisms, of a series ofinterior form-supports and a series of exterior curved circumferentially-discontinuous inflexible printingforms, each form applicableto and removable from its support and adjustable longitudinally andcircumferentially, the printingforms being composite and consisting ofan inner inflexible curved base of aluminium faced exteriorly withcopper and permanently adapted to fit the interior support, and a thinplanographic zinc printing-surface electrolytically deposited on thecurved base and integral therewith, the printing-form being arranged onthe impression-face of the drum and rotating positively therewith,substan tially as described.

39. In a printingpress, the combination with a two-part interiorform-supporting roller having a full roller J fixed to the shaft and asectional roller B loose on the shaft but adapted to be adjustedcircumferentially on the roller J and to be held flxed in suchadjustment, of an exterior curved circumferentially-discontinuousprinting-form, applicable to and removable from the sectional roller Bof the support and adjustable longitudinally on the sectional roller B,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

' EDWARD HE'lT.

Witnesses:

GEO. W. MILLs, J12, EDWIN SEGER.

